import Vue from 'vue';
import Router from 'vue-router';
import http from '@/utils/request';
import { isURL } from '@/utils/validate';

Vue.use(Router);

// 页面路由(独立页面)
export const pageRoutes = [
    {
        path: '/404',
        component: () => import('@/views/pages/404'),
        name: '404',
        meta: { title: '404未找到' },
        beforeEnter(to, from, next) {
            // 拦截处理特殊业务场景
            // 如果, 重定向路由包含__双下划线, 为临时添加路由
            if (/__.*/.test(to.redirectedFrom)) {
                return next(to.redirectedFrom.replace(/__.*/, ''));
            }
            next();
        }
    },
    { path: '/login', component: () => import('@/views/pages/login'), name: 'login', meta: { title: '登录' } }
];

// 模块路由(基于主入口布局页面)
export const moduleRoutes = {
    path: '/',
    component: () => import('@/views/main'),
    name: 'main',
    redirect: { name: 'home' },
    meta: { title: '主入口布局' },
    children: [
        { path: '/home', component: () => import('@/views/modules/home'), name: 'home', meta: { title: '首页', isTab: true } }
    ]
};

const router = new Router({
    mode: 'hash',
    scrollBehavior: () => ({ y: 0 }),
    routes: pageRoutes.concat(moduleRoutes)
});

router.beforeEach((to, from, next) => {
    // 添加动态(菜单)路由
    // 已添加或者当前路由为页面路由, 可直接访问
    if (window.SITE_CONFIG['dynamicMenuRoutesHasAdded'] || fnCurrentRouteIsPageRoute(to, pageRoutes)) {
        return next();
    }
    // 获取字典列表, 添加并全局变量保存
    http.get('/sys/dict/type/all').then(({ data: res }) => {
        if (res.code !== 0) {
            return;
        }
        window.SITE_CONFIG['dictList'] = res.data;
    }).catch(() => {});
    // 获取菜单列表, 添加并全局变量保存
    http.get('/sys/menu/nav').then(({ data: res }) => {
        if (res.code !== 0) {
            Vue.prototype.$message.error(res.msg);
            return next({ name: 'login' });
        }
        window.SITE_CONFIG['menuList'] = res.data;
        fnAddDynamicMenuRoutes(window.SITE_CONFIG['menuList']);
        next({ ...to, replace: true });
    }).catch(() => {
        next({ name: 'login' });
    });
});

/**
 * 判断当前路由是否为页面路由
 * @param {*} route 当前路由
 * @param {*} pageRoutes 页面路由
 */
function fnCurrentRouteIsPageRoute(route, pageRoutes = []) {
    var temp = [];
    for (var i = 0; i < pageRoutes.length; i++) {
        if (route.path === pageRoutes[i].path) {
            return true;
        }
        if (pageRoutes[i].children && pageRoutes[i].children.length >= 1) {
            temp = temp.concat(pageRoutes[i].children);
        }
    }
    return temp.length >= 1 ? fnCurrentRouteIsPageRoute(route, temp) : false;
}

/**
 * 添加动态(菜单)路由
 * @param {*} menuList 菜单列表
 * @param {*} routes 递归创建的动态(菜单)路由
 */
function fnAddDynamicMenuRoutes(menuList = [], routes = []) {
    var temp = [];
    for (var i = 0; i < menuList.length; i++) {
        if (menuList[i].children && menuList[i].children.length >= 1) {
            temp = temp.concat(menuList[i].children);
            continue;
        }
        // 组装路由
        var route = {
            path: '',
            component: null,
            name: '',
            meta: {
                ...window.SITE_CONFIG['contentTabDefault'],
                menuId: menuList[i].id,
                title: menuList[i].name
            }
        };
        // eslint-disable-next-line
    let URL = (menuList[i].url || '').replace(/{{([^}}]+)?}}/g, (s1, s2) => eval(s2)) // URL支持{{ window.xxx }}占位符变量
        if (isURL(URL)) {
            route['path'] = route['name'] = `i-${menuList[i].id}`;
            route['meta']['iframeURL'] = URL;
        } else {
            URL = URL.replace(/^\//, '').replace(/_/g, '-');
            route['path'] = route['name'] = URL.replace(/\//g, '-');
            route['component'] = () => import(`@/views/modules/${URL}`);
        }
        routes.push(route);
    }
    if (temp.length >= 1) {
        return fnAddDynamicMenuRoutes(temp, routes);
    }
    // 添加路由
    router.addRoutes([
        {
            ...moduleRoutes,
            name: 'main-dynamic-menu',
            children: routes
        },
        { path: '*', redirect: { name: '404' } }
    ]);
    window.SITE_CONFIG['dynamicMenuRoutes'] = routes;
    window.SITE_CONFIG['dynamicMenuRoutesHasAdded'] = true;
}

export default router;
